Ovo integration for Home Assistant - Unofficial API

I’ve recently started using Home Assistant to monitor my home. I’ve got 5 Aqara temperature and humidity sensors feeding in data via a ConBee II usb device, I’ve got a Hive integration, and I’ve got an Ovo integration. But I don’t understand what the Ovo integration is showing me. The documentation says

Sensors

This integration provides a few sensors for OVO Energy:

• Last Electricity Reading - Last meter reading consumption in kWh.
• Last Gas Reading - Last meter reading consumption in kWh.
• Last Electricity Cost - Last meter reading electricity cost.
• Last Gas Cost - Last meter reading gas cost.

But it doesn’t explain whether these are half hourly readings, or daily or something else. I’m also very suspicious of an electricity reading that’s decreased over the last 48 hours.

Has anyone on here used this Home Assistant integration, and if so what do they make of it?